Pen



FIG. 1 is a front left perspective view of a pen showing my new design with the pen tip retracted;

FIG. 2 is a rear right perspective view of the pen shown in FIG. 1 with the pen tip extended;

FIG. 3 is a rear right perspective view of the pen shown in FIG. 2 with the pen tip retracted;

FIG. 4 is front right perspective view of the pen shown in FIG. 1 with the pen tip extended;

FIG. 5 is a front elevation view of the pen shown in FIG. 1;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a right side view thereof;

FIG. 8 is a rear elevation view thereof;

FIG. 9 is a top plan view thereof; and,

FIG. 10 is a left side view thereof. 

The ornamental design for a pen, as shown and described. 